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Articles 5761 - 5790 of 8706
Full-Text Articles in Entire DC Network
Skyhunter: A Multi-Surface Environment For Supporting Oil And Gas Exploration, Teddy Seyed, Mario Costa Sousa, Frank Maurer, Anthony Tang
Skyhunter: A Multi-Surface Environment For Supporting Oil And Gas Exploration, Teddy Seyed, Mario Costa Sousa, Frank Maurer, Anthony Tang
Research Collection School Of Computing and Information Systems
The process of oil and gas exploration and its result, the decision to drill for oil in a specific location, relies on a number of distinct but related domains. These domains require effective collaboration to come to a decision that is both cost effective and maintains the integrity of the environment. As we show in this paper, many of the existing technologies and practices that support the oil and gas exploration process overlook fundamental user issues such as collaboration, interaction and visualization. The work presented in this paper is based upon a design process that involved expert users from an …
Understanding Online Consumer’S Inter-Purchase Time, Youngsoo Kim
Understanding Online Consumer’S Inter-Purchase Time, Youngsoo Kim
Research Collection School Of Computing and Information Systems
This study is motivated by the premise that online consumers can make a purchase at any time of day if they have even a tiny time slot along with Internet access. Given the increased shopping time flexibility, we first examine the patterns of online purchase timing at an online shopping mall handling diverse products (e.g., Amazon.com). The results show (1) the breakdown of purchase timing regularity and (2) the change of weekly spike purchase occurrence. Second, we build online inter-purchase time and price promotion utilization models and estimate them with the data collected from one of the premier online shopping …
Balancing Spirituality And Secularism, Globalism And Nationalism: The Geographies Of Identity, Integration And Citizenship In Schools, Lily Kong
Research Collection School of Social Sciences
Geographies of education have drawn more research attention in the last decade. The varied motivations for geographical attention to education have led to divergent approaches. First, a macro, political economy or "outward looking" approach has examined educational provision and what it tells us about wider social, economic and political processes. Second, a micro, social-cultural or "inward looking" approach has emphasised social difference within school spaces, and the links between home and educational spaces. This latter approach has also acknowledged the importance of the voices of children and young people in understanding educational experiences. In this paper, l take stock of …
Many Asias But One Singapore: The Problematics Of Creative Industry, Kirpal Singh
Many Asias But One Singapore: The Problematics Of Creative Industry, Kirpal Singh
Research Collection School of Social Sciences
The author discusses issues concerning the creative industry in Singapore. He highlights a National Conversation event which features the critical role and position of the creative industry in Lion City aiming to be a global hub for the arts and culture. He also highlights the Singapore Day celebration as well as the country's relationship with the other Asian countries.
Nonparametric Dynamic Panel Data Models: Kernel Estimation And Specification Testing, Liangjun Su, Xun Lu
Nonparametric Dynamic Panel Data Models: Kernel Estimation And Specification Testing, Liangjun Su, Xun Lu
Research Collection School Of Economics
Motivated by the first-differencing method for linear panel data models, we propose a class of iterative local polynomial estimators for nonparametric dynamic panel data models with or without exogenous regressors. The estimators utilize the additive structure of the first-differenced model—the fact that the two additive components have the same functional form, and the unknown function of interest is implicitly defined as a solution of a Fredholm integral equation of the second kind. We establish the uniform consistency and asymptotic normality of the estimators. We also propose a consistent test for the correct specification of linearity in typical dynamic panel data …
Robust Virtual Implementation With Almost Complete Information, Takashi Kunimoto
Robust Virtual Implementation With Almost Complete Information, Takashi Kunimoto
Research Collection School Of Economics
Artemov, Kunimoto, and Serrano (2013a,b, henceforth, AKS) study amechanism design problem where arbitrary restrictions are placed on the setof first-order beliefs of agents. Calling these restrictions Δ, they adopt Δ-rationalizability (Battigalli and Siniscalchi (2003)) and show that Δ-incentivecompatibility and Δ-measurability are necessary and sufficient conditions forrobust virtual implementation. By appropriately defining Δ in order to restrictattention to complete information environments, I exploit the implicationsof AKS and show that the permissive implementation result of Abreu andMatsushima (1992a) is robust to how the underlying type space is specified.However, AKS need to fix a complete information environment throughouttheir analysis and therefore does not …
Consistent Stereo Image Editing, Tao Yan, Shengfeng He, Rynson W.H. Lau, Yun Xu
Consistent Stereo Image Editing, Tao Yan, Shengfeng He, Rynson W.H. Lau, Yun Xu
Research Collection School Of Computing and Information Systems
Stereo images and videos are very popular in recent years, and techniques for processing this media are attracting a lot of attention. In this paper, we extend the shift-map method for stereo image editing. Our method simultaneously processes the left and right images on pixel level using a global optimization algorithm. It enforces photo consistence between the two images and preserves 3D scene structures. It also addresses the occlusion and disocclusion problem, which may enable many stereo image editing functions, such as depth mapping, object depth adjustment and non-homogeneous image resizing. Our experiments show that the proposed method produces high …
Is The Invocation Of Inherent Jurisdiction The Same As The Exercise Of Inherent Powers? Re Nalpon Zero Geraldo Mario [Case Note], Siyuan Chen
Research Collection Yong Pung How School Of Law
In Re McC (A Minor), Lord Bridge of Harwich remarked that few words have been ‘used with so many different shades of meaning in different contexts’ and ‘have so freely acquired new meanings’ as the word ‘jurisdiction’. The definitional conundrum deepens when ‘jurisdiction’ is combined with the adjective ‘inherent,’ yet common law courts around the world routinely claim to invoke inherent jurisdiction for a wide array of purposes in civil and criminal matters, ranging from the reception of evidence to the ensuring of a fair trial, and this necessarily raises questions about the limits of such an exercise.
Which Road To The Past? - Some Reflections On Legal History, Andrew B.L. Phang
Which Road To The Past? - Some Reflections On Legal History, Andrew B.L. Phang
Research Collection Yong Pung How School Of Law
It is not customary to commence a keynote address with caveats and disclaimers. However, this is the rare occasion when such qualifications are necessary because—if I may be permitted a crude pun—of the lack of qualifications of the speaker himself. This is not false modesty. It is very real. I know that I have often been referred to in the Singapore context as a legal historian.
A Collusion-Resistant Conditional Access System For Flexible-Pay-Per-Channel Pay-Tv Broadcasting, Zhiguo Wan, June Liu, Rui Zhang, Robert H. Deng
A Collusion-Resistant Conditional Access System For Flexible-Pay-Per-Channel Pay-Tv Broadcasting, Zhiguo Wan, June Liu, Rui Zhang, Robert H. Deng
Research Collection School Of Computing and Information Systems
Pay-TV Broadcasting system, an extensively de- ployed application, charges its subscribers when receiving the broadcasted video. A conditional access system (CAS) ensures security for the Pay-TV broadcasting system, which is designed to control TV channel/program access to only authorized subscribers. There are mainly three CAS models: pay-per-channel (PPC), pay-per-view (PPV), and flexible-pay-per-channel (F- PPC). F-PPC is a novel model which combines the properties and advantages of both PPC and PPV. Several key management schemes with four-level hierarchical key structure have been proposed for this model. In this paper, we point out a severe security weakness of these schemes against collusion …
Annotation For Free: Video Tagging By Mining User Search Behavior, Yao Ting, Tao Mei, Chong-Wah Ngo, Shipeng Li
Annotation For Free: Video Tagging By Mining User Search Behavior, Yao Ting, Tao Mei, Chong-Wah Ngo, Shipeng Li
Research Collection School Of Computing and Information Systems
The problem of tagging is mostly considered from the perspectives of machine learning and data-driven philosophy. A fundamental issue that underlies the success of these approaches is the visual similarity, ranging from the nearest neighbor search to manifold learning, to identify similar instances of an example for tag completion. The need to searching for millions of visual examples in high-dimensional feature space, however, makes the task computationally expensive. Moreover, the results can suffer from robustness problem, when the underlying data, such as online videos, are rich of semantics and the similarity is difficult to be learnt from low-level features. This …
Error Recovered Hierarchical Classification, Shiai Zhu, Xiao-Yong Wei, Chong-Wah Ngo
Error Recovered Hierarchical Classification, Shiai Zhu, Xiao-Yong Wei, Chong-Wah Ngo
Research Collection School Of Computing and Information Systems
Hierarchical classification (HC) is a popular and efficient way for detecting the semantic concepts from the images. However, the conventional HC, which always selects the branch with the highest classification response to go on, has the risk of propagating serious errors from higher levels of the hierarchy to the lower levels. We argue that the highestresponse-first strategy is too arbitrary, because the candidate nodes are considered individually which ignores the semantic relationship among them. In this paper, we propose a novel method for HC, which is able to utilize the semantic relationship among candidate nodes and their children to recover …
K-Time Proxy Signature: Formal Definition And Efficient Construction, Weiwei Liu, Guomin Yang, Yi Mu, Jiannan Wei
K-Time Proxy Signature: Formal Definition And Efficient Construction, Weiwei Liu, Guomin Yang, Yi Mu, Jiannan Wei
Research Collection School Of Computing and Information Systems
Proxy signature, which allows an original signer to delegate his/her signing right to another party (or proxy signer), is very useful in many applications. Conventional proxy signature only allows the original signer to specify in the warrant the validity time period of the delegation but not the number of proxy signatures the proxy signer can generate. To address this problem, in this paper, we provide a formal treatment for k-time proxy signature. Such a scheme allows a designated proxy signer to produce only a fixed number of proxy signatures on behalf of the original signer. We provide the formal definitions …
An Experimental Study For Inter-User Interference Mitigation In Wireless Body Sensor Networks, Bin Cao, Yu Ge, Chee Wee Kim, Gang Feng, Hwee-Pink Tan, Yun Li
An Experimental Study For Inter-User Interference Mitigation In Wireless Body Sensor Networks, Bin Cao, Yu Ge, Chee Wee Kim, Gang Feng, Hwee-Pink Tan, Yun Li
Research Collection School Of Computing and Information Systems
Inter-user interference degrades the reliability of data delivery in wireless body sensor networks (WBSNs) in dense deployments when multiple users wearing WBSNs are in close proximity to one another. The impact of such interference in realistic WBSN systems is significant but is not well explored. To this end, we investigate and analyze the impact of inter-user interference on packet delivery ratio (PDR) and throughput. We conduct extensive experiments based on the TelosB WBSN platform, considering unslotted carrier sense multiple access (CSMA) with collision avoidance (CA) and slotted CSMA/CA modes in IEEE 802.15.4 MAC, respectively. In order to mitigate interuser interference, …
Todmis: Mining Communities From Trajectories, Siyuan Liu, Shuhui Wang, Kasthuri Jayarajah, Archan Misra, Rammaya Krishnan
Todmis: Mining Communities From Trajectories, Siyuan Liu, Shuhui Wang, Kasthuri Jayarajah, Archan Misra, Rammaya Krishnan
Research Collection School Of Computing and Information Systems
Existing algorithms for trajectory-based clustering usually rely on simplex representation and a single proximity-related distance (or similarity) measure. Consequently, additional information markers (e.g., social interactions or the semantics of the spatial layout) are usually ignored, leading to the inability to fully discover the communities in the trajectory database. This is especially true for human-generated trajectories, where additional fine-grained markers (e.g., movement velocity at certain locations, or the sequence of semantic spaces visited) can help capture latent relationships between cluster members. To address this limitation, we propose TODMIS: a general framework for Trajectory cOmmunity Discovery using Multiple Information Sources. TODMIS combines …
Automatic Recovery Of Root Causes From Bug-Fixing Changes, Ferdian Thung, David Lo, Lingxiao Jiang
Automatic Recovery Of Root Causes From Bug-Fixing Changes, Ferdian Thung, David Lo, Lingxiao Jiang
Research Collection School Of Computing and Information Systems
No abstract provided.
Investor Heterogeneity, Investor-Management Disagreement And Share Repurchases, Sheng Huang, Anjan V. Thakor
Investor Heterogeneity, Investor-Management Disagreement And Share Repurchases, Sheng Huang, Anjan V. Thakor
Research Collection Lee Kong Chian School Of Business
This paper develops and tests a new theoretical explanation for stock repurchases. Investors may disagree with the manager about the firm's investment projects. A repurchase causes a change in the investor base as investors who are most likely to disagree with the manager tender their shares. Therefore, a firm is more likely to buy back shares when the level of investor-management agreement is lower, and agreement improves as a consequence. Moreover, dispersion of opinion among investors cannot explain repurchase activity once the stock price and investor-management agreement are controlled for. Overall, the evidence is consistent with firms strategically using repurchases …
The Myths Of G-Tech For Business Decision Making, Tin Seong Kam
The Myths Of G-Tech For Business Decision Making, Tin Seong Kam
Research Collection School Of Computing and Information Systems
More than 80% of organisation data are location related - the locations where transactions are done, where retailers are found, and of customers who buy their products. Since the early 2005, there has been an increasing interest among the business community to use geospatial technology to enhance decision making process at both strategic and operational levels. Millions of dollars and man-hours have been invested into driving their geo-technology development and implementation. The use of geospatial technology in business, however, tends to confine to simple mapping. Many of these failures are the victims of misperception. Some of the perpetrators are practitioners. …
Corporate Myths : Sourcing And Vendor Management In Asia Pacific, Singapore Management University
Corporate Myths : Sourcing And Vendor Management In Asia Pacific, Singapore Management University
Perspectives@SMU
Sourcing and vendor management need the urgent attention of senior management. The current uptick in poor and corrupt sourcing practices and weak governance provide a compelling reason.
Shrinkage Empirical Likelihood Estimator In Longitudinal Analysis With Time-Dependent Covariates: Application To Modeling The Health Of Filipino Children, Denis H. Y. Leung, Dylan S. Small, Jing Qin, Min Zhu
Shrinkage Empirical Likelihood Estimator In Longitudinal Analysis With Time-Dependent Covariates: Application To Modeling The Health Of Filipino Children, Denis H. Y. Leung, Dylan S. Small, Jing Qin, Min Zhu
Research Collection School Of Economics
The method of generalized estimating equations (GEE) is a popular tool for analysing longitudinal (panel) data. Often, the covariates collected are time-dependent in nature, for example, age, relapse status, monthly income. When using GEE to analyse longitudinal data with time-dependent covariates, crucial assumptions about the covariates are necessary for valid inferences to be drawn. When those assumptions do not hold or cannot be verified, Pepe and Anderson (1994, Communications in Statistics, Simulations and Computation 23, 939–951) advocated using an independence working correlation assumption in the GEE model as a robust approach. However, using GEE with the independence correlation assumption may …
Robust Bayesian Model Selection, Yong Li, Jun Yu
Robust Bayesian Model Selection, Yong Li, Jun Yu
Research Collection School Of Economics
This paper extends the robust Bayesian inference in misspecified models of Müller (2013, Econometrica) to Bayesian model selection of a set of misspecified models. It is shown that when a model is misspecified, under the Kullback-Leibler loss function, the risk associated with Müller's posterior is less (weakly) than that with the original posterior distribution asymptotically. Based on this new result, two new information criteria are proposed for model selection under model misspecification. Sufficient conditions are provided for the risk associated with Müller's posterior to be strictly smaller.
Alternative Predictors For Dealing With The Diversity-Validity Dilemma In Personnel Selection: The Constructed Response Multimedia Test, Britt De Soete, Filip Lievens, Janneke Oostrom, Lena Westerveld
Alternative Predictors For Dealing With The Diversity-Validity Dilemma In Personnel Selection: The Constructed Response Multimedia Test, Britt De Soete, Filip Lievens, Janneke Oostrom, Lena Westerveld
Research Collection Lee Kong Chian School Of Business
In the context of the diversity-validity dilemma in personnel selection, the present field study compared ethnic subgroup differences on an innovative constructed response multimedia test to other commonly used selection instruments. Applicants (N=245, 27% ethnic minorities) for entry-level police jobs completed a constructed response multimedia test, cognitive ability test, language proficiency test, personality inventory, structured interview, and role play. Results demonstrated minor ethnic subgroup differences on constructed response multimedia test scores as compared to other instruments. Constructed response multimedia test scores were related to the selection decision, and no evidence for predictive bias was found. Subgroup differences were also examined …
Do Candidate Reactions Relate To Job Performance Or Affect Criterion-Related Validity? A Multistudy Investigation Of Relations Among Reactions, Selection Test Scores, And Job Performance, Julie Mccarthy, Chad H. Van Iddekinge, Filip Lievens, Mavis Mei-Chuan Kung, Evan F. Sinar, Michael A. Campion
Do Candidate Reactions Relate To Job Performance Or Affect Criterion-Related Validity? A Multistudy Investigation Of Relations Among Reactions, Selection Test Scores, And Job Performance, Julie Mccarthy, Chad H. Van Iddekinge, Filip Lievens, Mavis Mei-Chuan Kung, Evan F. Sinar, Michael A. Campion
Research Collection Lee Kong Chian School Of Business
Considerable evidence suggests that how candidates react to selection procedures can affect their test performance and their attitudes toward the hiring organization (e.g., recommending the firm to others). However, very few studies of candidate reactions have examined one of the outcomes organizations care most about: job performance. We attempt to address this gap by developing and testing a conceptual framework that delineates whether and how candidate reactions might influence job performance. We accomplish this objective using data from 4 studies (total N = 6,480), 6 selection procedures (personality tests, job knowledge tests, cognitive ability tests, work samples, situational judgment tests, …
Short Sales Constraint And Seo Pricing, Charlie Charoenwong, David K. Ding, Ping Wang
Short Sales Constraint And Seo Pricing, Charlie Charoenwong, David K. Ding, Ping Wang
Research Collection Lee Kong Chian School Of Business
We examine the influence of SEC's Rule 105 on informed trading and the information content of stock prices around an SEO's offer day. We show that constraints on short sales inhibit informed trading and hamper incorporation of information into stock prices for offers whose traders have private adverse information and without options listing. The constraints contribute to increased price uncertainty and higher market sensitivity to seller-initiated trading. After controlling for other causes of SEO discounts, we find that the decrease in information content of stock prices just before an offer day has a significant impact on the SEO's value discount.
Emotion Regulation In Workgroups: The Roles Of Demographic Diversity And Relational Work Context, Eugene Kim, Devasheesh P. Bhave, Theresa M. Glomb
Emotion Regulation In Workgroups: The Roles Of Demographic Diversity And Relational Work Context, Eugene Kim, Devasheesh P. Bhave, Theresa M. Glomb
Research Collection Lee Kong Chian School Of Business
Drawing on the social identity perspective, we investigate the cross-level relationship between demographic diversity in workgroups and emotion regulation. We propose that age, racial, and gender diversity in workgroups relate positively to emotion regulation because of demography-related in-group/out-group dynamics. We also examine the moderating role of the relational work context, specifically task interdependence and social interaction, on the relationship between demographic diversity and emotion regulation. Results from a sample of 2,072 employees in 274 workgroups indicate that working in a group with greater age diversity is positively related to an employee's emotion regulation. Results suggest the operation of the age …
Family Ownership And Ceo Turnovers, Xia Chen, Qiang Cheng, Zhonglan Dai
Family Ownership And Ceo Turnovers, Xia Chen, Qiang Cheng, Zhonglan Dai
Research Collection School Of Accountancy
This paper investigates the impact of the founding family’s presence on CEO turnover decisions. We find that family firms managed by CEOs outside the founding family (i.e., professional CEO family firms) have higher CEO turnover-performance sensitivity than family firms managed by family members (i.e., family CEO firms) or non-family firms. These results are robust to alternative performance measures and CEO turnover definitions. Additional analyses indicate that higher family ownership leads to even higher (lower) turnover-performance sensitivity in professional CEO family firms (family CEO firms). These results indicate that, with regard to CEO turnover decisions, better monitoring of CEOs by family …
Ias 39 Reclassification Choice And Analyst Earnings Forecast Properties, Chee Yeow Lim, Chu Yeong Lim, Gerald J. Lobo
Ias 39 Reclassification Choice And Analyst Earnings Forecast Properties, Chee Yeow Lim, Chu Yeong Lim, Gerald J. Lobo
Research Collection School Of Accountancy
In October 2008, the International Accounting Standards Board amended IAS 39 to allow banks to retroactively reclassify financial assets that previously were measured at fair value to amortized cost. By reclassifying financial assets, a bank can potentially avoid recognizing the unrealized fair value losses and thereby increase its income and regulatory capital during a market downturn. We examine the implications of the reclassification decision by banks for the properties of financial analyst earnings forecasts during 2008–2009, when economic conditions were highly volatile. We find that the reclassification choice during the financial crisis reduced analyst forecast accuracy and increased forecast dispersion. …
Managerial Incentives And Management Forecast Precision, Qiang Cheng, Ting Luo, Heng Yue
Managerial Incentives And Management Forecast Precision, Qiang Cheng, Ting Luo, Heng Yue
Research Collection School Of Accountancy
Managers have great discretion in determining forecast characteristics, but little is known about how managerial incentives affect these characteristics. This paper examines whether managers strategically choose forecast precision for self-serving purposes. Building on the prior finding that the market reaction to vague forecasts is weaker than its reaction to precise forecasts, we find that for management forecasts disclosed before insider sales, more positive (negative) news forecasts are more (less) precise than other management forecasts. The opposite applies to management forecasts disclosed before insider purchases. These results are consistent with managers strategically choosing forecast precision to increase stock prices before insider …
Managerial Incentives And Management Forecast Precision, Qiang Cheng, Ting Luo, Heng Yue
Managerial Incentives And Management Forecast Precision, Qiang Cheng, Ting Luo, Heng Yue
Research Collection School Of Accountancy
Managers have great discretion in determining forecast characteristics, butlittle is known about how managerial incentives affect these characteristics. This paperexamines whether managers strategically choose forecast precision for self-servingpurposes. Building on the prior finding that the market reaction to vague forecasts isweaker than its reaction to precise forecasts, we find that for management forecastsdisclosed before insider sales, more positive (negative) news forecasts are more (less)precise than other management forecasts. The opposite applies to managementforecasts disclosed before insider purchases. These results are consistent withmanagers strategically choosing forecast precision to increase stock prices beforeinsider sales and to decrease stock prices before insider purchases. …
Will Fault Localization Work For These Failures? An Automated Approach To Predict Effectiveness Of Fault Localization Tools, Tien-Duy B. Le, David Lo
Will Fault Localization Work For These Failures? An Automated Approach To Predict Effectiveness Of Fault Localization Tools, Tien-Duy B. Le, David Lo
Research Collection School Of Computing and Information Systems
Debugging is a crucial yet expensive activity to improve the reliability of software systems. To reduce debugging cost, various fault localization tools have been proposed. A spectrum-based fault localization tool often outputs an ordered list of program elements sorted based on their likelihood to be the root cause of a set of failures (i.e., their suspiciousness scores). Despite the many studies on fault localization, unfortunately, however, for many bugs, the root causes are often low in the ordered list. This potentially causes developers to distrust fault localization tools. Recently, Parnin and Orso highlight in their user study that many debuggers …